Peters



3 Sheets- Sheet M. W. LESTER.

HOT AIR PURNAGE.

Patented Aug.' 31, '1869.

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' Hog? AIR PURNAGB. l No. 94,224 Patented Aug. ,31,'1'869.

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HOT AIR FURNAGE. l No. 94,224. Patented Aug. 31, V1869;

N. PETERS. Pwin-uuwgnpur. washington. ILC.

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MOSES W. LESTER, OF CHICAGO, ILLINOIS,

Letters Patent N 94 224, dated Atig'ust'il, 1869.

HOT-AIR FURNACE.

'. lhe Schedule referred to in these Letters Patent and making part of the same.

To whom 4it may concern Be it known that I, Moses W. Les'rnn, of Chicago, in the county of Cook, and State of Illinois, have invented a newand useful Improvement in Air-Heating Furnaces; and I do hereby declare that the following is a truc and -accurate description thereof, reference being had to the accompanying drawings, and t0 the letters of reference marked thereon, and being apart ot this specification, in which- Figure 1, plate l, is a vertical section of my improved furnace;

Figure 2, plate 2, is a cross-section on the line .t :t of tig. l; v

Figure 3 is the same on the line y y;

Figure 4 is the same on the line z z of tig. l; and

Figure 5 is a vertical section through the tire-pot and ash-pit, showing Vthe method of inclining the grate for removing the clinkers.

Like letters indicate like parts in each tignre.

lhe nature of this invention relates to au improved constiuction of air-heating furnaces, wherein bituminous coal is used asfuel, and consists in the peculiar arrangement of an inner air-chambersurrounding the magazine, said chamber being suppliedwith air through pipes which connect it with au outer air-chamber. The air which rises through this inner annular space is heated in its passage by radiation from the inner wall of the combustiomchamber surrounding it, while at the same time it prevents heating to a high degree the magazine, andthus causes its contents to throw on noxiousgases, as would be the case were the flame to pass up in contact with its exteriorwall.

It also consists in providing the lower end of thc magazine with a combustion-ring of cast-metal so arranged that its expansion and contraction do not atiect the surrounding parts, and being of great weight and strength, will resist the destructive action ot' hea-tand abrasion ot the coal on its lower edges much longer than any known .equivalent device now in use for that purpose;- also, in a novel method of hinging the grate, which may be inclined forward to remove the clinkers accumulating upon it without danger ot' dumping and extinguishing thc lire, and the general arrangement'of its parts, as hereinafter more fully shown and set forth.

A, tig. l, represents the open base ot' my improved furnace supported by proper lugs;

B is the ash-pit; and

C, the fire-pot. Y

I) is the gas-ring, forming the lower-most section of the annular combustion-chamber.

The lower part of this ing is provided with inwardlyprojecting studs d, which 4rest upon thc edges of the nre-pot, leaving an annular space between it and thev lower edge of the ring, through whichk passes, as in dicated by the arrows, a thin sheet of air, whose oxyf gen combining with the unconsuined products of the combustion of the coal below, insures immediate and perfect combustion ot' the whole.

d are wings projecting inward from the body of the gas-ring, which wings support thc combustion-ring E by its flange.

The ring E is a heavy casting, forming the lower end of the magazine F, which is lilled withA coal through the chute f at its top.

By making this combustion-ling independent of the surrounding parts, they are not liable'to damage from its contraction and expansion, and being of considerable depth and thickness, it will resist for a long time the destructive action of the heat on its lower edge and abrasion of the continually-descending coal, while those ot ordinary construction, from either ofthe causes cited, seldom last a season.

Surrounding the magazine is a cylinder, G, which, in turn, is surrounded by a similar cylinder, H, while I is the outer casing of the whole.

The bases of the cylinder G and magazine F are flanged in the upper edge of the combustion-ring E, that of the cylinder H to the gas-ring D, and of the casing I to the rim of the base A.

J is a plate covering the cylinder H and the interior cylinders, and forms the bottom of the smoke-box, of which the platef'K is the top andfk the lue.

L is the covering-plate ofthe furnace, and forms the top of the hot-air chamber, from which the hot-air pipes l convey the heated air to the desired points.

By the arrangement of the concentric cylinders above described, I have an outer annular air-chamber, M, an innerv one, N, and a combustion -chamber, O, between them.

The air-chambers M and N are connected at intervals by pipes P, admitting air from the former into the latter.

From the chamber N, the air is conducted to the reservoir at the top by tubes Q passing through the plates .I and K 'of the smoke-box, so that the heated products ot combustion in their upward passage through the chamber O, heat two columns of air, -instead of one, by outward radiation froin the cylinder H, and inward from the. cylinder G, while' the ila-Ine is not allowed to come in Contact with themagazine, and heat the coal in it, and cause it to throw ott` noxious gases.

It. arevv openings in the bottom-plate J of the smokebox, through which the heated products of combustion pass, impin ging against and passing between the tubes Q on their way to the flue, imparting additional heat to the currents of air passing up through the tubes.

a. and b are doors, tightly ttcd to the front of the outer casing and smoke-box, through which access is had to the interior ot' the smoke-box to clear the bot- 'tom-plate J of ashes when necessary.

` in the {ire-pot.

The arrangement of my grate is an important feature of this inveutiou,.which I will now deseribe S is a circular grate, centrally pivoted to a crank or arm, c, on'the rockshaft T, journalled into the sides of the ash-pit under theback edge of the grate, which is supported in front by a boit, g, working in a sleeve in the upper part of the ash-pit.

The grate is provided with a lug, t, under its frontedge, in a recess in which a bar or rod is insertedto give the grate avihratory motion on its pivot to shake down theashes.

To remove the clnkers from the surface of the grate without dum ping the fire in to the ash-pit, I piace horizontally, on one cud of the rock-shaft, the lever U, (which, to he shown in the drawing, is vertical.) With this lever in one hand, I support the grate; with the other, I withdraw the. bolt g, and with the leverrasily incline the grate forward, the coals beingsupported by the'roar part ofthe grate, which, from the peculiar manner in u hich it is hung, moves but slightly, so as not to break the arch naturally formed hy the coals \Vith my free hand, I insert a poker and rake the clin'kers from the surface of the grate into the ash-pit, when tlie'grate may be raised to and secured in posit-ion.

As air, in heating, parts with a portion of its hydrogen, to replace it in the air passing through this furnace, I placean eraporatil'ig-pan, V, .containing water on the front of the ash-pit for that purpose.

easily replaced, when necessary; and in adouble radiatiuff-surface, by means of which the greatest amount of air is heated with the least consumption of fuel.

XVhat I claim as my invention, and desire to secure by Letters Patent, is p 1. In air-heating furnaces, the coinbinationof the combustioil-chamber O with the annular air-chambers M and N, the pipes P, and tubes Q, when constructed, arranged, and forth.

2. The gas-ring l), provided with studs d and wings d', and the combustion-ring,r E, arranged and operating substantially as and` for the purposes herein set forth. 3. The rock-shaft T, provided with arm c and the grate S, when pivoted to said arm and supported by the bolt y, the whole arranged and operating substantially in the nimmer-and for the purposes herein speci- -fied andv shown.

noses w. LESTER.

Witnesses:

H. F. Eunrs, i (I. W. SERS-'oss operating as and I'orthe purposeset 

